I wasn't trying to make a point about which race has the most bosses related to it by blood or something. I was saying that, in the Burning Crusade, the blood elves are the only ones whose racial leader -- their King -- has gone from a great hero to a terrible enemy of their people, and indeed for all of life on Azeroth. That's a pretty dramatic shift, and it was the driving force for much of the Burning Crusade story.

Kael'thas turned out to be a much bigger deal than even Illidan, whom we thought the Burning Crusade story was going to be about. That's kinda the neat thing though. :) You never know what's going to happen do ya?

Of course the eredar and the draenei have their racial leader issues too, what with the draenei being somewhat related to Kil'jaeden and all. But, to me at least, that didn't seem to be as essential to the plot as the blood elf elements were.

Incidentally, in Warcraft 3 (and maybe to some extent in Wrath of the Lich King too), it's the human's great leader figure who got turned into a bad guy. Maybe in the future it may be a common theme of other races too.